//1.first we leaarn about forEach()method

const array=[1,2,3,4,5,6];

// want to tervarsal every index

array.forEach((item)=>{

console.log(item);

})

//Three divisor element

//an other method

array.forEach((item,index,arr)=>{

if(item%3===0)

console.log(item);

});

// 2.method of array map()=>alwayes return a new array

const array1=[1,2,3,4,5,6,7,8,9,87];

const newArray1=array1.map((num)=>{

return num*num;

})

console.log(newArray1);

//an other method

const array2=[1,2,3,4,5,6,7,8,9,87];

const newArray2=array2.map((num,index,array)=>{

return num*num*num;

})

console.log(newArray2);

//an other method

const array3=[1,2,3,4,5,6,7,8,9,87];

const newArray3=array3.map((num,index,array)=>{

num*num*num;

})

console.log(newArray3);

/**output of my code

* [

undefined, undefined,

undefined, undefined,

undefined, undefined,

undefined, undefined,

undefined, undefined

]

*///

//an othor method

const array4=[1,2,3,4,5,6,7,8,9,87];

newArray4=array4.map((num,index,array)=> num*num*num);

console.log(newArray4);

//3.method filter()

const array5=[3,23,244,203,21,22342,1123,13];

const newArray5=array5.filter((nums,index,arr)=>nums%2===0);

console.log(newArray5)//index and arr are optional

//[ 244, 22342 ]

//4.method reduce()

const array6=[4,2,6,5,7,8,9];

const newarray6=array6.reduce((sum,num,index,array)=>{

return sum=sum+num;

},0);

console.log(newarray6)//41

// other method

const array7 = ['a', 'b', 'c'];

for (const element of array7) {

console.log(element);//abc

}